Microsoft and Nvidia held a launch party for the first wave of RTX Spark laptops last week in San Francisco, where a new wave of AI PCs took center stage amid a packed crowd and a lively hands-on area. A day after the media event, I was invited to a quieter Nvidia event to hear a lot more about the new RTX Spark computing platform. While Nvidia's new laptops might look like regular Windows machines, the chips inside are Arm-based, instead of the traditional x64 architecture used by AMD and Intel. Combined with a powerful GPU, RTX Spark is designed for the future of AI, and it means a lot of work has gone into getting these laptops ready for …